Aerovironment

Established in 1991, Aspen Environmental Group is a multidisciplined environmental company that specializes in a range of environmental impact assessment, power generation, mitigation monitoring and air quality permitting services. It offers a variety of flood control and watershed planning services, such as floodplain mapping, flood drainage assessment, watershed simulation, hydrologic routing, and analysis of detention basins and alternative flood control strategies. The various projects undertaken by the company include Matilija Dam Ecosystem Restoration, Canoga Park New Elementary School, Littlerock Reservoir, Los Angeles County Drainage Area and Diablo Canyon Nuclear Power Plant. In addition, it offers habitat restoration, hydraulic analysis and biological surveying services to its clients. The company has locations in San Diego, Phoenix and Agoura Hills, Calif.

HCI Environmental & Engineering Service, based in Corona, CA, is a full-service environmental management company specializing in a wide range of hazardous and non-hazardous waste services. Their offerings include 24/7 emergency chemical spill response, waste transportation, disposal, and various remediation services aimed at protecting public health and the environment. With a commitment to customer service and operational efficiency, HCI prides itself on its experienced team that ensures compliance with safety regulations and environmental standards. The company continually seeks improvements to meet the diverse needs of its clients, from meth lab cleanup to electronic waste recycling and beyond. Generated from the website

Tetra Tech is one of the leading providers of specialized management consulting and technical services. The company focuses on the areas of resource management, infrastructure, and communications. Tetra Tech was founded to provide engineering services related to waterways, harbors and coastal areas. The company has since increased the size and scope of its business and expanded its service offerings through a series of strategic acquisitions and internal growth. Tetra Tech provides environmental services, water and wastewater management, infrastructure services, security design and outsourced technical services. The company had nearly 7,500 employees located in more than 250 offices throughout the world. Tetra Tech was founded in 1966 and is based in Pasadena, Calif.